Cast
James Donald
Michael Heathley
Herbert Lom
Dr. Alex Leon
Robert Beatty
Maj. Sam Seagram
Walter Fitzgerald
Sir Charles Craddock
Patric Doonan
Brian Jackson
Maurice Denham
Prof. Carrington
Cyril Chamberlain
Inspector Carter
Phyllis Calvert
Lydia Heathley
Muriel Pavlow
Caroline Cartier
Marjorie Fielding
Michael's Mother
Herbert Lomas
George Jackson
Stanley Maxted
Prof. Adams
Philip Ray
Sentry (uncredited)
Johnnie Schofield
Jim Barnes (uncredited)
Noel Willman
Dr. Dennis Bord
Hal Osmond
Agent Lawson
Marianne Stone
Maisie
Hartley Power
General Adams (uncredited)